Global warming is human caused
In January 2015, the U.S. Senate voted on an amendment sponsored by Senator Brian Schatz (D-HI) stating that: “it is the sense of Congress that — (1) climate change is real; and (2) human activity significantly contributes to climate change.” 50 Senators voted in favor of the amendment, while 49 opposed it.
We recently published an article in the peer-reviewed journal Nature Climate Change describing a new statistical model that accurately estimates public opinion about climate change in all 50 states. Using the new model, we have calculated the percentage of Americans within each state that:
1) believe that global warming is caused mostly by human activities or is caused by both human activities and natural changes; or
2) believe that global warming is either not happening or caused mostly by natural changes.
Each Senator’s vote is tallied in either the “Yea Votes” or “Nay Votes” column, where a “Yea” means the Senator voted that climate change is significantly human-caused. The orange bars depict the percent of the public who believe climate change is at least partly human caused, while the blue bars depict the percent of the public who believe climate change is not happening or naturally caused. The far right column subtracts the people who say it is not happening or naturally caused from those who say it is human-caused, summarizing the predominant view of the public within each state.
In 43 of the 50 states, more people say global warming is human-caused than not, while in only three states do more people say global warming is not happening or naturally caused, than human-caused (four states were split evenly). At one end of the spectrum is Hawaii (Senator Schatz’s home state), where more than twice as many people think global warming is human caused (67%) than think it is not (32%) – a difference of 35 percentage points. At the other end of the spectrum, slightly more people in Wyoming think global warming is not happening or natural (51%) than think it is caused by human activities (47%) – a difference of 4 percentage points.
The comparison finds that Senators were more likely to vote “Yea” on the Schatz amendment if they represent states where a majority of constituents think global warming is at least partly caused by human activities. Senators from states where the public was evenly split or slightly more likely to say global warming isn’t happening or naturally caused were more likely to vote “Nay.”
Several Senators took positions different than their constituents. For example, Senator Cory Gardner (R-CO) voted against the Schatz amendment, yet Coloradans are 17 percentage points more likely to believe climate change is human caused than not. Likewise, Senator Dean Heller (R-NV) (a difference of 16 points) and Senator Marco Rubio (R-FL) (a difference of 14 points) each voted against the amendment, expressing a view at odds with a majority of their constituents.
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